Hi All,

i am really new to the world of Cars but did quite some reversing project before.

in the last weeks i wrote decoding tools for .sgo and .frf files to decrypt/decode the Firmwares of the RKE ECU (3C0959433T)
But i dont have such an ECU in Hardware available.

So can anybody help me to indentify which CPU type is used in 3C0959433T (or any other Remote Key Entry ECU)
so i can start reversing in IDA.

I tried all Tricore types but no luck yet - code does not seem from Tricore CPU.

any hints ?
 Kind Regards and  Thank you in advance.

unpacked another RKE ECU 1K0959433CT_0218

this one starts at 0xFC0000 - identical code but assumed adresses fit to location F8 <-> FC

FF01
630F00FC
63F104FC
636301FC

000A001A0742036F146C62A150A134FC350351A16C42A1546F01719FFCFF1BFFFFFFFFF0071B0000....

How fancy chip is it. If simple, probably 9s12 or hc12, descendants of hc11, descendants of 6800, extended.

Otherwise fancier ones are either Motorola 68k descendants, or powerpc. I don't think I've ever seen PPC in ECU though.

So look at 6800 instruction set first, see any similarity. All the 6800 boot to 0xffff:fffe but backwards endianess from the rest of the CPU.